Accession Number : ADA557350


Title :   The Reduction of Advanced Military Aircraft Noise


Descriptive Note : Final rept. 8 May 2007-31 Oct 2011


Corporate Author : PENNSYLVANIA STATE UNIV STATE COLLEGE


Personal Author(s) : Morris, Philip J ; McLaughlin, Dennis ; Sparrow, Victor ; Bridges, James ; Henderson, Brenda ; Plotkin, Kenneth ; Martens, Steve ; McKinley, Richard


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA557350


Report Date : Dec 2011


Pagination or Media Count : 191


Abstract : This report describes a combined experimental and computational study of the generation and radiation of jet noise from high performance military fighter aircraft. An emphasis is on the methodology for scaling measurements at small and moderate scale to full scale aircraft engines. Promising concepts for jet noise reduction are explored at small and moderate scale. Numerical simulations are performed to support the experiments and provide additional insight into the noise generation and radiation process. Noise and flow measurements are performed in the Anechoic Jet Noise Research Facility at Penn State and the Aero-Acoustic Propulsion Laboratory at the NASA Glenn Research Center. Designs for the baseline nozzles are developed by General Electric Aviation. A computational study of the effect of chevrons on the jet flow is conducted by General Electric and used to design chevron nozzles that are then studied experimentally by NASA and Penn State. The results were transferred for use in the Advanced Acoustic Model, which is used to assess the impact of aircraft operations on communities surrounding military bases.


Descriptors :   *AIRCRAFT NOISE , *JET AIRCRAFT NOISE , *MILITARY AIRCRAFT , *NOISE REDUCTION , ACOUSTIC EQUIPMENT , AIRCRAFT ENGINES , JET FLOW , MILITARY FACILITIES , NOISE GENERATORS , NOZZLES , NUMERICAL ANALYSIS , PROPULSION SYSTEMS , RADIATION , RESEARCH FACILITIES , SCALE , SCALING FACTOR


Subject Categories : Aircraft
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE